Lamp



R. A. OLDHELD.

LAMP.

APPLICATION FILED JAN.23,1919.

Patented May 4, 1920.

ROBERT ALEXANDER OLDFIELD, OF BIRMINGHAM, ENGLAND.

LAMP.'

Specification of Letters Patent.

Patented May 4, 1920.

Application filed January 23, 1919. Serial No. 272,762.

To all whom it may 001206771.

Be it known that 1, ROBERT ALEXANDER ilnorinno, a subject of the Kingdomof Great Britain, residing at Refulgent Works, WVarwick street,liordesley, Birmingham, in the county of W arwick, England, haveinvented certain new and useful improvements in Lamps, of which thefollowing is a specification.

This invention comprises a lamp or lantern for use in connection withguns such as machine guns, and it has for its purpose to provide a lampor lantern which forms an illuminated target by virtue of which the gunmay be sighted in the dark.

With this object in view it is desirable to provide a lamp which willwithstand very high wind, which is light-proof, which is unspillable,and which is of a highly durable character.

In order that this invention may be clearly understood and readilycarried into practice, reference may be had to, the appended explanatorysheet of drawings, upon which Figure 1 is a perspective view of a lampaccording to the present invention.

Fig. 2 is a sectional elevation of the lamp shown in Fig. 1.

Fig. 3 is a part view of the oil reservoir, and particularlyillustrating the burner socket.

Fig. 1 is an inverted view of the burner.

According to the present invention I em ploy a lamp body 1, in which acircular window 2 of frosted glass is provided. Centrally in this windowa circular area 3 of clear glass is incorporated; this circular area ofclear glass may be encircled by a sheet metal annular frame 4 which maybe supported by radial strips 5 extending to a frame 6 encircling thecircular window so that when the central unfrosted area of glass iscovered by a suitable shutter, an annular windowremains in the center ofwhich a dark circle occurs. The shutter for this purpose may comprise adisk 7 provided with an arm 8 through which latter a pivot 9 passes.This disk 7 normally covers the central unfrosted area 3 of the window.This is the position when the lamp is in use, in which a black centralbulls eye is obtained encircled by an annular margin of illuminatedwindow. The shutter is for the purpose of permitting of the adjustmentof the wick in order, for instance, to determine the degree of lightrequired. After this ad j ustment has been effected the central area iscovered by the shutter.

The body of the lamp may comprise a rectangular box, in the top of whicha chimney provided of a character adapted to prevent the emission oflight. 10 is a transverse partition in the interior of the boxlikebody 1. This partition carries a conical chimney ll converging upwardly,which chimneyv 11 is substantially contained within the part of the boxbody 1 which is above the partition 10. 12 is a cylindrical chimneyextending from the top of the box body 1. This chimney 12 is covered bya dome 13 in which egress apertures 14 are provided. At positionsadjacent to theegress openings 1 1 the chimney 12 is provided withtonguelike projections 15 adapted'to function as baiiies. 16 are airadmission perforations in the body 1 adapted'to admit air which passesexternally of the chimney 11 and internally within the chimney 12 toegress therefrom with the productsof combustion by way of the openings14:. For admitting air for combustion at the burner an inner wall 1'7may be provided in parallelism with one or" the side walls of the lampto form an intermediate flue or down-take, to the upper part of whichair is admitted by way of perforations 18. 19 is a curved partition inthe fine or down-take, in which curved partition perforations areprovided. The air is delivered to the interior of the body at the bottomof the down-take. Other air may enterby way of an opening 20 in thebottom of the lamp body. This opening 20 admits to a shallow space orchamber below the burner reservoir, which space or chamber is closed atthe top by a horizontal partition 21 which forms the base for saidreservoir, the latter being adapted to be detachably installed upon saidbase in any approved manner. 22 is a circular vertical partitionencircling the perforation 20, in which circular vertical partitionperforations are provided. Air entering at 20 is baffled by thepartition 22 and is enabled to egress by way of perforations 23 in thepartition which forms the upper wall of the shallow space between thereservoir and the bottom closure member of the lamp body. Said bottomclosure memher is advantageously hinged and adapted to be fastened byany suitable form of fastening 24:.

The burner may be furnished with a tube 25 which extends downwardly to'aposition near to the bottom of the reservoir. In this tube superposedtruncated cones 26 are provided converging downwardly. The wick 27passes through these cones and oil is elevated thereby. At a positionbelow the top and bottom of the reservoir a horizontal partition 28 isprovided. The depending tube 25 passes through this partition.erforations or openings 29 are provided in the said partitionadvantageously at positions near to the corners thereof. Should the lampbe placed on one side or inverted, the reservoir being about half full,the oil cannot escape through the burner as this is avoided by the tubedepending therefrom, and the cones within said tube. The said cones alsoserve to prevent egress of splashed oil, splashing being avoided orcounteracted, however, by the perforated horizontal partition.

The spindle 30 by which the wick is operated may carry a toothed wheel31 which meshes with a toothed wheel 32 mounted in the inner wall of thelamp body, which forms the ventilation down-take above mentioned. Theouter wall of this part of the lamp body may be discontinued over acircle, the center of which is the axis of the toothed wheel which iscarried by the said wall, and around this circle the space be tween thewalls is closed by an annular closure portion 33 which may be bentinwardly from the outer sheet metal wall. As a result of this formationa shallow depression is provided in the side of the lamp, in whichdepression an operating lever or handle 3% may be incorporated to permitof the rotation of the toothed wheel carried by the lamp body. The lampthus substantially involves no projecting parts which would be liable todamage.

35 is a ring which rotatably encircles the body of the burner, and whichring 35 is formed with tongues 36. The said tongues are adapted toengage with a rim 37 provided upon the burner socket. This rim isaccordingly slotted at 38 so that the tongues 36 may be passed throughthe slots, and the ring 35 may then be rotated to engage with the rim37. 39 is a spring which is suitably incorporated below the rim 37; two'of these springs may be incorporated and they may be of such acharacter that the tongues 36 upon rotation of the ring 35 are adaptedto pass beyond the bowed parts of said springs, depressing said bowedparts with the result that the said bo'wed parts form stops preventingthe accidental release of the ring 35. The end of the spring 39 may beadapted to constitute a stop for the tongue 36, as shown at 40. 41 is ashoulder upon which may be provided a fiber or other soft washer whichis compressed by the engagement of the tongues 36 with the rim 37 tothereby form an effective oi1-tight joint.

lVhat I claim as my invention and desire to secure by Letters Patent isA lamp having an annular window of frosted glass encircling a smallerwindow of transparent glass and an opaque shutter adapted to bedisplaced to cover and uncover the transparent area.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

ROBERT ALEXANDER OLDFI'ELD.

Witnesses ARTHUR H. BROWN, EDGAR N. WHEELER.

